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[NETFILTER]: SCTP conntrack: fix crash triggered by packet without chunks

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When a packet without any chunks is received, the newconntrack variable
in sctp_packet contains an out of bounds value that is used to look up an
pointer from the array of timeouts, which is then dereferenced, resulting
in a crash. Make sure at least a single chunk is present.

Problem noticed by George A. Theall <theall@tenablesecurity.com>

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy 2006-06-29 21:40:23 -07:00 committed by David S. Miller
parent 2c6059bca8
commit dd7271feba
2 changed files with 2 additions and 2 deletions
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2
net/ipv4/netfilter/ip_conntrack_proto_sctp.c
View file

@ -254,7 +254,7 @@ static int do_basic_checks(struct ip_conntrack *conntrack,
}
DEBUGP("Basic checks passed\n");
return 0;
return count == 0;
}
static int new_state(enum ip_conntrack_dir dir,

2
net/netfilter/nf_conntrack_proto_sctp.c
View file

@ -261,7 +261,7 @@ static int do_basic_checks(struct nf_conn *conntrack,
}
DEBUGP("Basic checks passed\n");
return 0;
return count == 0;
}
static int new_state(enum ip_conntrack_dir dir,